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normal-admin/node_modules/element-plus/lib/directives/trap-focus/index.js

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+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var vue = require('vue');
+var aria = require('../../utils/dom/aria.js');
+var event = require('../../utils/dom/event.js');
+var aria$1 = require('../../constants/aria.js');
+
+const FOCUSABLE_CHILDREN = "_trap-focus-children";
+const TRAP_FOCUS_HANDLER = "_trap-focus-handler";
+const FOCUS_STACK = [];
+const FOCUS_HANDLER = (e) => {
+  if (FOCUS_STACK.length === 0)
+    return;
+  const code = event.getEventCode(e);
+  const focusableElement = FOCUS_STACK[FOCUS_STACK.length - 1][FOCUSABLE_CHILDREN];
+  if (focusableElement.length > 0 && code === aria$1.EVENT_CODE.tab) {
+    if (focusableElement.length === 1) {
+      e.preventDefault();
+      if (document.activeElement !== focusableElement[0]) {
+        focusableElement[0].focus();
+      }
+      return;
+    }
+    const goingBackward = e.shiftKey;
+    const isFirst = e.target === focusableElement[0];
+    const isLast = e.target === focusableElement[focusableElement.length - 1];
+    if (isFirst && goingBackward) {
+      e.preventDefault();
+      focusableElement[focusableElement.length - 1].focus();
+    }
+    if (isLast && !goingBackward) {
+      e.preventDefault();
+      focusableElement[0].focus();
+    }
+  }
+};
+const TrapFocus = {
+  beforeMount(el) {
+    el[FOCUSABLE_CHILDREN] = aria.obtainAllFocusableElements(el);
+    FOCUS_STACK.push(el);
+    if (FOCUS_STACK.length <= 1) {
+      document.addEventListener("keydown", FOCUS_HANDLER);
+    }
+  },
+  updated(el) {
+    vue.nextTick(() => {
+      el[FOCUSABLE_CHILDREN] = aria.obtainAllFocusableElements(el);
+    });
+  },
+  unmounted() {
+    FOCUS_STACK.shift();
+    if (FOCUS_STACK.length === 0) {
+      document.removeEventListener("keydown", FOCUS_HANDLER);
+    }
+  }
+};
+
+exports.FOCUSABLE_CHILDREN = FOCUSABLE_CHILDREN;
+exports.TRAP_FOCUS_HANDLER = TRAP_FOCUS_HANDLER;
+exports["default"] = TrapFocus;
+//# sourceMappingURL=index.js.map